6.已知等差数列{an的前n项和为Sn,且a1,,s成公比为q的等比数列,则q等于A.1或2B.1或3C.2D.3+: =0.7.若x,y满足{x≥1则下列不等式恒成立的是x-y≥0,A.≥2B.x-2y≥0C.x+2y≥0D.2x-y-1≥08.在边长为1的等边三角形ABC中,点P是边AB上一点,且BP=2PA,则CPAB=A2B131C.3169.已知函数f(x-2)是定义在R上的偶函数,且对任意的x1,x2∈[,+)(x1≠x2),总有应f(x1-2)-f(x2-2)x1-x2>0,则A.f(3)